Poster presentation

Space Science Seminar

  • Wednesday, February 22, 2017 -
    3:00pm to 4:00pm
     ·  Space Science Seminar
    Matthew Argall, UNH

    Abstract: Magnetic reconnection involves the conversion of electromagnetic energy into particle kinetic energy. This energy conversion begins at the electron scale, which was largely inaccessible to direct satellite observations before the Magnetospheric Multiscale (MMS) mission. MMS, launched in March, 2015, consists of four satellites in a tetrahedron formation with mean separation of as little as 7 km, or 2-3 electron skin depths at the magnetopause. It captures full 3D distribution functions of ions every 150ms and of electrons every 30ms.

  • Wednesday, February 8, 2017 -
    3:00pm to 4:00pm
     ·  Space Science Seminar
    Dr. Jichun Zhang, UNH

    Abstract:  Electromagnetic ion cyclotron (EMIC) waves play an important role in the overall dynamics of the Earth’s magnetosphere. Particularly, these waves contribute to the energization and loss of magnetospheric particles. For instance, EMIC waves can interact with relativistic electrons in the radiation belts as well as energetic ions in the ring current, resulting in rapid scattering loss.

  • Wednesday, November 30, 2016 -
    3:00pm to 4:00pm
     ·  Space Science Seminar
    Prof. Kaijun Liu, Auburn University

    Abstract: Fast magnetosonic waves are enhanced waves at frequencies close to the proton cyclotron frequency and its harmonics (up to the lower hybrid frequency) observed near the geomagnetic equator in the terrestrial magnetosphere. They can pitch-angle scatter as well as energize radiation belt electrons. The waves arise from the ion Bernstein instability driven by ring-like proton velocity distributions with a positive slope with respect to the perpendicular velocity (∂f(v_perp)/∂v_perp>0).

  • Wednesday, November 9, 2016 -
    3:00pm to 4:00pm
     ·  Space Science Seminar
    Daniel Verscharen, UNH

    Abstract: The solar wind is a magnetized plasma that exhibits turbulent fluctuations on many scales. In addition to the non-compressive Alfvénic component of the turbulence, a compressive component with slow-mode-like polarization is commonly observed. These fluctuations are associated with characteristic spatio-temporal changes in the particle distribution functions. If the amplitude of the turbulent fluctuations is large enough, the moments of the fluctuating distribution functions cross the thresholds for various kinetic micro-instabilities.

  • Wednesday, November 2, 2016 -
    3:00pm to 4:00pm
     ·  Space Science Seminar
    Naomi Maruyama, NOAA
  • Wednesday, October 26, 2016 -
    3:00pm to 4:00pm
     ·  Space Science Seminar
    Doug Cramer, UNH

    Abstract: Narrow flow bursts in the plasma sheet have been found to be responsible for the majority of plasma injected into the inner magnetosphere. We examine the character and behavior of these flow bursts during geomagnetic storm and quiet times using a global magnetosphere MHD model (OpenGGCM) that is coupled to a kinetic ring current model (Rice Convection Model).

  • Wednesday, October 12, 2016 -
    3:30pm to 4:00pm
     ·  Space Science Seminar
    Charles Farrugia, UNH

    Abstract: We discuss plasma, magnetic and electric field data for a flux transfer event (FTE) to highlight improvements in our understanding of these transient reconnection signatures resulting from high resolution data. The ~20 s-long, reverse FTE, which occurred south of the geomagnetic equator near dusk, was immersed in super-Alfvenic flow.  We focus on (i) providing the first observations of field line draping of the external field around the flux rope; (ii) motivating the use of non-force free methods in modeling FTE flux ropes. 
     

  • Wednesday, October 12, 2016 -
    3:00pm to 3:30pm
     ·  Space Science Seminar
    Love Alm, UNH

    Abstract: One major challenge of analyzing MMS data is to put the observation in the right context, linking them to specific parts of the reconnection region. We will examine methods of estimating the satellite's position inside the reconnection region and a methods reconstructing the geometry of the reconnection region.
     

  • Thursday, October 6, 2016 -
    2:00pm to 3:00pm
     ·  Space Science Seminar
    John Murphy, Ph.D, Sales Director

    Abstract: Silicon Photomultipliers (SiPMs) have become the go-to modern photodetector for an ever-expanding range of scintillation-based systems in medical and security applications. They are now being adopted in many industrial & automotive applications and the High Energy Physics community continues to find new uses for the technology.
     

  • Wednesday, September 28, 2016 -
    3:00pm to 4:00pm
     ·  Space Science Seminar
    Roy Torbert and Love Alm

    Abstract: We will discuss two events in detail of dayside, asymmetric reconnection, from Phase 1A of MMS: one with no guide field, and another with appreciable one. Comparisons to Ohm’s Law terms will also be discussed.